This Sample demonstrates the PayloadFactory mediator to perform transformations as an alternative to XSLT mediator, which is demonstrated in Sample 8: Introduction to Static and Dynamic Registry Resources and Using XSLT Transformations . In this sample, the ESB implements the Message Translator EIP enterprise integration pattern and acts as a translator between the client and the back-end server when mediating a message to a sample back-end server from a sample client.
<p:getquote xmlns:p="http://services.samples"> <p:request> <p:code>IBM</p:code> </p:request> </p:getquote>
But the service expects the message in this format:
<p:getquote xmlns:p="http://services.samples"> <p:request> <p:symbol>IBM</p:symbol> </p:request> </p:getquote>
Similarly, the service will send the response in this format:
<m:checkpriceresponse xmlns:m="http://services.samples/xsd"> <m:symbol>IBM</m:symbol> <m:last>84.76940826343248</m:last> </m:checkpriceresponse>
But the client expects the response in this format:
<m:checkpriceresponse xmlns:m="http://services.samples/xsd"> <m:code>IBM</m:code> <m:price>84.76940826343248</m:price> </m:checkpriceresponse>
To resolve this discrepancy, we will use the PayloadFactory mediator to transform the message into the request format required by the service and the response format required by the client.
Refer to For a list of prerequisites, see the Prerequisites section in ESB Samples Setup page.
Building the Sample
1. Start the ESB with sample 17 configuration using the instructions given in Starting Sample ESB Configurations.
2. A message should appear in the command or text Linux console stating the server started successfully.
4. Deploy the back-end service 'SimpleStockQuoteService' and start the Axis2 server using the instructions given in section Starting Sample Back-End Services.
5. Now you have a running ESB instance and a back-end service deployed. In the next section, we will send a message to the back-end service through the ESB using a sample client.
The sample client used here is 'Stock Quote Client' which can operate in multiple modes. For instructions on this sample client and its operation modes, refer to Stock Quote Client.
1. Run the custom quote client as '
ant stockquote -Dmode=customquote ...' from